<!DOCTYPE html>
 	<html>
 	<head>
 	<meta charset="utf-8">
 	<title>热卖</title>
 	<link rel="stylesheet" type="text/css" href="style.css" id="b.css">
 	</head>
 	<div class="nav">
 	<ul>
 	 
 		<<li><a href="../index.html">返回首页</a></li>
 		
 	</ul>
 	</div>
 	
 	<body><body bgcolor="pink">
 	<center>
 	<h1>熠熠生辉，岁月漫长，然而值得等待。</h1>
 	
 	<img src="春季热卖.jpg" width="750" height="1222" alt=""/>
 		
 		<img src="春季热卖3.jpg" width="750" height="1156" alt=""/>

<div  class="mac"></div>

 	<img src="热卖4.jpg" width="750" height="1156" alt=""/>
 	<img src="热卖5.jpg" width="750" height="1156" alt=""/>
 	</body>
 	<center>
 		<p></p>
 		<p></p>
 		<p></p>
 		
 		<div class="desc">质量在的心中，名牌在的手中，责任在的肩上，诚信在的言行中。质量赢信誉，信誉得效益。质量以我为本，我以质量为荣。质量体现素养，素养决定质量，质量决定生存。质量是我们的自尊。</div>
 		<font color="#FF0000"><a href="https://www.jd.com"><h1>点击购买<h1></a></font>
 			<div  class="mac"></div>
 			<select id="changecss" onchange="change()">
  	    <option value="style.css">背景1</option>
  	    <option value="b.css">背景2</option>
    </select>
    <script type="text/javascript">
    	  function change(){
        document.getElementById("b.css").href=document.
        getElementById("changecss").value;}
        </script>
 	</html>